"There have been many times in my life when I've been filled with nerves and adrenaline before a big game, but nothing compares to the terror of singing live in front of a full house at Twickenham."

Another member of the chorus, Mike Catt, said: "We've all had some practice singing in public as we've all belted out the national anthem before kick-off, but I don't think that compares to having to sing in tune for three minutes."